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gh-121459: Deferred LOAD_GLOBAL (GH-123128) 

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Sam Gross <655866+colesbury@users.noreply.github.com>
This commit is contained in:
Ken Jin 2024-09-14 00:23:51 +08:00 committed by GitHub
parent 74330d992b
commit 8810e286fa
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GPG Key ID: B5690EEEBB952194
8 changed files with 108 additions and 29 deletions
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2
Include/internal/pycore_ceval.h
View File

@ -271,7 +271,7 @@ PyAPI_FUNC(PyObject **) _PyObjectArray_FromStackRefArray(_PyStackRef *input, Py_
PyAPI_FUNC(void) _PyObjectArray_Free(PyObject **array, PyObject **scratch);
PyAPI_FUNC(PyObject *) _PyEval_GetANext(PyObject *aiter);
PyAPI_FUNC(PyObject *) _PyEval_LoadGlobal(PyObject *globals, PyObject *builtins, PyObject *name);
PyAPI_FUNC(void) _PyEval_LoadGlobalStackRef(PyObject *globals, PyObject *builtins, PyObject *name, _PyStackRef *writeto);
PyAPI_FUNC(PyObject *) _PyEval_GetAwaitable(PyObject *iterable, int oparg);
PyAPI_FUNC(PyObject *) _PyEval_LoadName(PyThreadState *tstate, _PyInterpreterFrame *frame, PyObject *name);

3
Include/internal/pycore_dict.h
View File

@ -10,6 +10,7 @@ extern "C" {
#include "pycore_object.h" // PyManagedDictPointer
#include "pycore_pyatomic_ft_wrappers.h" // FT_ATOMIC_LOAD_SSIZE_ACQUIRE
#include "pycore_stackref.h" // _PyStackRef
// Unsafe flavor of PyDict_GetItemWithError(): no error checking
extern PyObject* _PyDict_GetItemWithError(PyObject *dp, PyObject *key);
@ -100,10 +101,12 @@ extern void _PyDictKeys_DecRef(PyDictKeysObject *keys);
*/
extern Py_ssize_t _Py_dict_lookup(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr);
extern Py_ssize_t _Py_dict_lookup_threadsafe(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject **value_addr);
extern Py_ssize_t _Py_dict_lookup_threadsafe_stackref(PyDictObject *mp, PyObject *key, Py_hash_t hash, _PyStackRef *value_addr);
extern Py_ssize_t _PyDict_LookupIndex(PyDictObject *, PyObject *);
extern Py_ssize_t _PyDictKeys_StringLookup(PyDictKeysObject* dictkeys, PyObject *key);
PyAPI_FUNC(PyObject *)_PyDict_LoadGlobal(PyDictObject *, PyDictObject *, PyObject *);
PyAPI_FUNC(void) _PyDict_LoadGlobalStackRef(PyDictObject *, PyDictObject *, PyObject *, _PyStackRef *);
/* Consumes references to key and value */
PyAPI_FUNC(int) _PyDict_SetItem_Take2(PyDictObject *op, PyObject *key, PyObject *value);

74
Objects/dictobject.c
View File

@ -1496,6 +1496,45 @@ read_failed:
return ix;
}
Py_ssize_t
_Py_dict_lookup_threadsafe_stackref(PyDictObject *mp, PyObject *key, Py_hash_t hash, _PyStackRef *value_addr)
{
PyDictKeysObject *dk = _Py_atomic_load_ptr(&mp->ma_keys);
if (dk->dk_kind == DICT_KEYS_UNICODE && PyUnicode_CheckExact(key)) {
Py_ssize_t ix = unicodekeys_lookup_unicode_threadsafe(dk, key, hash);
if (ix == DKIX_EMPTY) {
*value_addr = PyStackRef_NULL;
return ix;
}
else if (ix >= 0) {
PyObject **addr_of_value = &DK_UNICODE_ENTRIES(dk)[ix].me_value;
PyObject *value = _Py_atomic_load_ptr(addr_of_value);
if (value == NULL) {
*value_addr = PyStackRef_NULL;
return DKIX_EMPTY;
}
if (_Py_IsImmortal(value) || _PyObject_HasDeferredRefcount(value)) {
*value_addr = (_PyStackRef){ .bits = (uintptr_t)value | Py_TAG_DEFERRED };
return ix;
}
if (_Py_TryIncrefCompare(addr_of_value, value)) {
*value_addr = PyStackRef_FromPyObjectSteal(value);
return ix;
}
}
}
PyObject *obj;
Py_ssize_t ix = _Py_dict_lookup_threadsafe(mp, key, hash, &obj);
if (ix >= 0 && obj != NULL) {
*value_addr = PyStackRef_FromPyObjectSteal(obj);
}
else {
*value_addr = PyStackRef_NULL;
}
return ix;
}
#else // Py_GIL_DISABLED
Py_ssize_t
@ -1506,6 +1545,15 @@ _Py_dict_lookup_threadsafe(PyDictObject *mp, PyObject *key, Py_hash_t hash, PyOb
return ix;
}
Py_ssize_t
_Py_dict_lookup_threadsafe_stackref(PyDictObject *mp, PyObject *key, Py_hash_t hash, _PyStackRef *value_addr)
{
PyObject *val;
Py_ssize_t ix = _Py_dict_lookup(mp, key, hash, &val);
*value_addr = val == NULL ? PyStackRef_NULL : PyStackRef_FromPyObjectNew(val);
return ix;
}
#endif
int
@ -2420,6 +2468,32 @@ _PyDict_LoadGlobal(PyDictObject *globals, PyDictObject *builtins, PyObject *key)
return value;
}
void
_PyDict_LoadGlobalStackRef(PyDictObject *globals, PyDictObject *builtins, PyObject *key, _PyStackRef *res)
{
Py_ssize_t ix;
Py_hash_t hash;
hash = _PyObject_HashFast(key);
if (hash == -1) {
*res = PyStackRef_NULL;
return;
}
/* namespace 1: globals */
ix = _Py_dict_lookup_threadsafe_stackref(globals, key, hash, res);
if (ix == DKIX_ERROR) {
*res = PyStackRef_NULL;
}
if (ix != DKIX_EMPTY && !PyStackRef_IsNull(*res)) {
return;
}
/* namespace 2: builtins */
ix = _Py_dict_lookup_threadsafe_stackref(builtins, key, hash, res);
assert(ix >= 0 || PyStackRef_IsNull(*res));
}
/* Consumes references to key and value */
static int
setitem_take2_lock_held(PyDictObject *mp, PyObject *key, PyObject *value)

12
Python/bytecodes.c
View File

@ -1469,8 +1469,8 @@ dummy_func(
&& PyDict_CheckExact(BUILTINS()))
{
v_o = _PyDict_LoadGlobal((PyDictObject *)GLOBALS(),
(PyDictObject *)BUILTINS(),
name);
(PyDictObject *)BUILTINS(),
name);
if (v_o == NULL) {
if (!_PyErr_Occurred(tstate)) {
/* _PyDict_LoadGlobal() returns NULL without raising
@ -1526,12 +1526,12 @@ dummy_func(
#endif /* ENABLE_SPECIALIZATION */
}
op(_LOAD_GLOBAL, ( -- res, null if (oparg & 1))) {
// res[1] because we need a pointer to res to pass it to _PyEval_LoadGlobalStackRef
op(_LOAD_GLOBAL, ( -- res[1], null if (oparg & 1))) {
PyObject *name = GETITEM(FRAME_CO_NAMES, oparg>>1);
PyObject *res_o = _PyEval_LoadGlobal(GLOBALS(), BUILTINS(), name);
ERROR_IF(res_o == NULL, error);
_PyEval_LoadGlobalStackRef(GLOBALS(), BUILTINS(), name, res);
ERROR_IF(PyStackRef_IsNull(*res), error);
null = PyStackRef_NULL;
res = PyStackRef_FromPyObjectSteal(res_o);
}
macro(LOAD_GLOBAL) =

20
Python/ceval.c
View File

@ -3110,15 +3110,14 @@ _PyEval_GetANext(PyObject *aiter)
return awaitable;
}
PyObject *
_PyEval_LoadGlobal(PyObject *globals, PyObject *builtins, PyObject *name)
void
_PyEval_LoadGlobalStackRef(PyObject *globals, PyObject *builtins, PyObject *name, _PyStackRef *writeto)
{
PyObject *res;
if (PyDict_CheckExact(globals) && PyDict_CheckExact(builtins)) {
res = _PyDict_LoadGlobal((PyDictObject *)globals,
_PyDict_LoadGlobalStackRef((PyDictObject *)globals,
(PyDictObject *)builtins,
name);
if (res == NULL && !PyErr_Occurred()) {
name, writeto);
if (PyStackRef_IsNull(*writeto) && !PyErr_Occurred()) {
/* _PyDict_LoadGlobal() returns NULL without raising
* an exception if the key doesn't exist */
_PyEval_FormatExcCheckArg(PyThreadState_GET(), PyExc_NameError,
@ -3128,13 +3127,16 @@ _PyEval_LoadGlobal(PyObject *globals, PyObject *builtins, PyObject *name)
else {
/* Slow-path if globals or builtins is not a dict */
/* namespace 1: globals */
PyObject *res;
if (PyMapping_GetOptionalItem(globals, name, &res) < 0) {
return NULL;
*writeto = PyStackRef_NULL;
return;
}
if (res == NULL) {
/* namespace 2: builtins */
if (PyMapping_GetOptionalItem(builtins, name, &res) < 0) {
return NULL;
*writeto = PyStackRef_NULL;
return;
}
if (res == NULL) {
_PyEval_FormatExcCheckArg(
@ -3142,8 +3144,8 @@ _PyEval_LoadGlobal(PyObject *globals, PyObject *builtins, PyObject *name)
NAME_ERROR_MSG, name);
}
}
*writeto = PyStackRef_FromPyObjectSteal(res);
}
return res;
}
PyObject *

9
Python/executor_cases.c.h generated
View File

@ -1661,15 +1661,14 @@
}
case _LOAD_GLOBAL: {
_PyStackRef res;
_PyStackRef *res;
_PyStackRef null = PyStackRef_NULL;
oparg = CURRENT_OPARG();
res = &stack_pointer[0];
PyObject *name = GETITEM(FRAME_CO_NAMES, oparg>>1);
PyObject *res_o = _PyEval_LoadGlobal(GLOBALS(), BUILTINS(), name);
if (res_o == NULL) JUMP_TO_ERROR();
_PyEval_LoadGlobalStackRef(GLOBALS(), BUILTINS(), name, res);
if (PyStackRef_IsNull(*res)) JUMP_TO_ERROR();
null = PyStackRef_NULL;
res = PyStackRef_FromPyObjectSteal(res_o);
stack_pointer[0] = res;
if (oparg & 1) stack_pointer[1] = null;
stack_pointer += 1 + (oparg & 1);
assert(WITHIN_STACK_BOUNDS());

9
Python/generated_cases.c.h generated
View File

@ -5674,7 +5674,7 @@
PREDICTED(LOAD_GLOBAL);
_Py_CODEUNIT *this_instr = next_instr - 5;
(void)this_instr;
_PyStackRef res;
_PyStackRef *res;
_PyStackRef null = PyStackRef_NULL;
// _SPECIALIZE_LOAD_GLOBAL
{
@ -5696,13 +5696,12 @@
/* Skip 1 cache entry */
// _LOAD_GLOBAL
{
res = &stack_pointer[0];
PyObject *name = GETITEM(FRAME_CO_NAMES, oparg>>1);
PyObject *res_o = _PyEval_LoadGlobal(GLOBALS(), BUILTINS(), name);
if (res_o == NULL) goto error;
_PyEval_LoadGlobalStackRef(GLOBALS(), BUILTINS(), name, res);
if (PyStackRef_IsNull(*res)) goto error;
null = PyStackRef_NULL;
res = PyStackRef_FromPyObjectSteal(res_o);
}
stack_pointer[0] = res;
if (oparg & 1) stack_pointer[1] = null;
stack_pointer += 1 + (oparg & 1);
assert(WITHIN_STACK_BOUNDS());

8
Python/optimizer_cases.c.h generated
View File

@ -829,11 +829,13 @@
}
case _LOAD_GLOBAL: {
_Py_UopsSymbol *res;
_Py_UopsSymbol **res;
_Py_UopsSymbol *null = NULL;
res = sym_new_not_null(ctx);
res = &stack_pointer[0];
for (int _i = 1; --_i >= 0;) {
res[_i] = sym_new_not_null(ctx);
}
null = sym_new_null(ctx);
stack_pointer[0] = res;
if (oparg & 1) stack_pointer[1] = null;
stack_pointer += 1 + (oparg & 1);
assert(WITHIN_STACK_BOUNDS());